R. Yaacov Haber (Torahlab) discusses how Betzalel's positive reaction to his being selected as the designer and artisan of the Mishkan reminds us that we should never shirk from our responsibilities, regardless of our inner doubts about our own capabilities: link

Moshe Rabbeinu's Instructions to Betzalel

The Gaon Yaakov sheds new light on a discussion between Moshe and Betzalel about the order of construction for the Mishkan: link